TMI: bleeding after sex

Taylor • 21 Mama to an angel 👼 Mommy to a little boy Ttc baby #3
I am 18 weeks and 2 days pregnant. I've never experienced bleeding after sex but tonight after intercourse I went pee and noticed pinkish blood it wasn't an over-excessive amount but it concerned me since i had a miscarriage with our last baby at 19weeks. Should I be concerned? Has anyone else experienced this? Should I go to the doctors?